Highlander, you said the down side to DFI is that it doesn't use a MAF sensor. What makes you think not using a MAF is a down fall?
This is a plus, as speed density has no restrictive MAF sensor. This also eliminates a part to replace if it fails. Let me know what you think.

 

IT takes a lot more tuning and tweaking to get it right w/o a maf... why is it restrictive?? its the same diameter as my vortech elbow... ???

 

I think its common knowledge that MAF sensors do cause some restriction in the intake. I've never actually tested it, but if I had to choose what would flow more cfm's, a piece of tubing with nothing inside of it, or a piece of tubing, equal in inner diameter and length, with a small air flow metering device mounted inside, I'm gonna have to choose the empty piece of tubing. It might be a very slight difference, but a difference none the less. With speed density, tuning is more difficult at lower RPM's, but in my opinion, and obviously the opinions of engineers designing these engine management set ups, speed density is the way to go on a high horse power street car. If you wanted to take that a step further, as far as performance is concerned, the BEST for high power is an alpha-N set up. This set up will only be seen on race cars though. Driveability on the street with one of these setups would be terrible.

 

I have posted this many times before in the hopes of helping people out. While is sounds like the original poster has already purchased a system and while I wish him the best of luck, I'd advise people to think long and hard before buying an aftermarket ECM for a street car. It can be a very lengthy and frustrating process to get the drivability to where you are used to with a factory system. Getting it to start and run and adjusting the AF ratio and timing for max power is the easy part, that's why these systems can be ideal for a race car. But getting the throttle response and light load running down is far from easy. A fairly big part of the work that comes into the shop I'm associated with is tuning the aftermarket sytems that people buy and install. Many of these cars barely run and some come in on a trailer. And the guys who installed them are often quite experienced car guys.

Just FYI.

Rich Krause

 

I agree Rich. These systems are not as easy to tune as the manufacturers would like potential buyers to believe. I run Gen 7 DFI in my daily driver. I am VERY aware of the tuning and driveability issues. I play with low RPM, low engine load tuning often, and still don't have it perfect. It's good, but not perfect. You really have to know what your doing to get one of these systems to run good on the street.

If you don't have a VERY good understanding of how speed density fuel injection works, don't get one of these systems unless you have a shop in your area that can tune it, and the money to pay to have it done.

 

'68LT1camaro: That's very good advice. I am glad yours is working well and am guessing that you were pretty knowledgable in the first place or went through a LOT of trial and error. It's impossible to be certain in advance and it partly depends on prior experience the shop has with a similar combo, but on an hourly basis figure 6-8 hours if you want a pro to get it to the level where it sounds you are on your own . Locally, this means close to $1,000 for tuning and maybe more.

Rich

 

Thanks for the compliment Rich. It means alot to me coming from you!

 

Hey Guys,

Nah, I haven't bought the system yet. I tried, but Accel wouldn't sell it directly to me, and I didn't have the time/cash to have it professionally installed and tuned. It's not a big deal cause I used the cash to pick up my 4340 rotating assembly for my turbo project. I still plan to get the DFI down the road somewhere, but for now I'm working on a daily driver (my S10) so I won't have to worry about needing my car all the time so I can drop it off and have everything installed and tuned. It will probably be a while before I get started back on the turbo project, but I WILL eventually get to it.

BTW, Electromotive, Motec, and Pectel all offer mass air stand alones, but they are about twice the price of the Accel and FAST systems. Just a thought for ya Highlander.

 

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HHHHMMMMMMMMM!!! INTERESTING!!!

 

The maf has a bit of a restriction, but not a HUGE one.. the advantages it offers far surpass the restriction area, specifically if driveability is a must on a "daily usable" car.

I really like the MAF and most setups dont account for this... I dont understand why aren't many computer systems that have the capability of the OEM. or something similar to an LT1 in various things.. that is why I wanted a boosted calibration for the lt1 pcm.. it would make everything so much simpler... just the acceleronics and a 2 bar map sensor and off we go, counting that the maf has no restriction...

Maybe one day.

 

What ever happen with that bin file you were going to get developed?

 

5k minimum.. no one said anything.. im not going to invest the money on something that had no interest in the market...

 

Yeah, it's not easy to get 500 people to pitch in $10 each.

 

Who was that qoute from ?